Battery Pack Thermal Management System

Electric Vehicle Battery Thermal Management System Combining Split Dual Refrigerant Circulation Lines and Indirect Air Heat Exchange

This technology separates the first circulation line for cooling electronic components from the second circulation line for battery pack and cabin thermal management. By performing indirect heat exchange through air circulation between the evaporator and the second heat exchanger, it minimizes pressure loss and reduces system complexity.

Conventional chiller-based systems often suffer from complex configurations because the battery loop and cabin loop share coolant or rely on direct heat exchange. Furthermore, direct heat exchange with the electronic component loop creates unnecessary pressure loss within the refrigerant loop.

This technology features a separate first circulation line for electronic components and a second circulation line for the battery pack and cabin. It uses multiple valve devices to control refrigerant flow and connects the evaporator and second heat exchanger via indirect air circulation, allowing for waste heat recovery and flexible switching between cooling and heating modes. Applicable to integrated thermal management modules for EVs and hybrids, as well as HVAC systems for electric buses and commercial vehicles, it helps reduce winter driving range loss and simplifies refrigerant piping design.

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Key Features:

• A first circulation line through which a first refrigerant flows to cool electronic components via a first compressor and a first heat exchanger
• A second circulation line through which a second refrigerant flows to cool or heat the battery pack via a second compressor and a condenser
• A first branch line that connects the space between the first compressor and the first heat exchanger, and the space between the electronic components and the first heat exchanger, to bypass the first refrigerant
• An accumulator formed in the second circulation line to pass the second refrigerant before it enters the second compressor

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This invention was developed with support from the Ministry of Science and ICT for research into carbon-neutral dry reforming reaction mechanisms based on high-yield, high-selectivity, and high-stability heterogeneous alloy catalysts.

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